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Evaluate the integral given below.

integral(x^2+13)^2dx

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lots of ways but brute force:
(x^2 + 13)^2 = x^4 + 26 x^2 + 169
so integrate
x^4 dx + 26 x^2 dx + 169 dx
x^5/5 + 26 (x^3/3) + 169 x + constant

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